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Abstract. Two types of composite materials containing micro- and nanoparticles of copper in a polyethylene matrix were created and studied. Transmission electron microscopy established that the size of the formed nanoparticles is 13 nm, while X-ray phase analysis indicated that the copper nanoparticles have a "core-shell" structure. The study of the temperature dependence of the electrical conductivity of copper microparticles at fixed pressures showed that the oxide shell has a semiconductor nature. The conductivity and static dielectric permittivity of polyethylene containing nano- and microparticles of copper were measured near the percolation threshold. It was found that below this threshold, discrepancies between the experimental data and the predictions of modern heterogeneous system theory are observed. It was also established that in polyethylene-based composites with copper nanoparticles, an additional contribution to electrical conductivity and dielectric permittivity is observed in the region below the percolation threshold. The reasons for this effect were analyzed, taking into account the spatial structure of the material within the framework of the model proposed by Balberg and his co-authors for composite systems.
Key words. Composite nanomaterial, polyethylene, copper, electrical conductivity, dielectric permittivity.
DOI: http://uzpolymerjournal.com/articles/article.php?id=250205
Citation: Saitkulov D.R., ELECTRICAL CONDUCTIVITY AND DIELECTRIC PERMITTIVITY OF COMPOSITE POLYMER MATERIALS BASED ON POLYETHYLENE CONTAINING COPPER NANOPARTICLES. Uzbekistan Journal of Polymers, Vol. 4(2) 2025: pp.40-47. DOI: http://uzpolymerjournal.com/articles/article.php?id=250205
